Tests.

test.js

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+'use strict';
+
+var test = require('tape');
+var isDate = require('./');
+var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
+
+test('not Dates', function (t) {
+	t.notOk(isDate(), 'undefined is not Date');
+	t.notOk(isDate(null), 'null is not Date');
+	t.notOk(isDate(false), 'false is not Date');
+	t.notOk(isDate(true), 'true is not Date');
+	t.notOk(isDate(42), 'number is not Date');
+	t.notOk(isDate('foo'), 'string is not Date');
+	t.notOk(isDate([]), 'array is not Date');
+	t.notOk(isDate({}), 'object is not Date');
+	t.notOk(isDate(function () {}), 'function is not Date');
+	t.notOk(isDate(/a/g), 'regex literal is not Date');
+	t.notOk(isDate(new RegExp('a', 'g')), 'regex object is not Date');
+	t.end();
+});
+
+test('@@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, function (t) {
+	var realDate = new Date();
+	var fakeDate = { valueOf: function () { return realDate.getTime(); }, toString: function () { return String(realDate); } };
+	fakeDate[Symbol.toStringTag] = function () { return 'Date'; };
+	t.notOk(isDate(fakeDate), 'fake Date with @@toStringTag "Date" is not Date');
+	t.end();
+});
+
+test('Dates', function (t) {
+	t.ok(isDate(new Date()), 'new Date() is Date');
+	t.end();
+});